Hello thanks for writing to us.Irregular periods
are usually due hormonal
imbalance. A period early by 5 days is not an issue this usually happens, but prolonged bleeding for 15 days a matter of concern. Prolonged periods
along with abdominal distension and cramps needs examination by a Doctor. Yes you should visit a doctor who may examine you and may advice you some investigations like abdominal ultra sound
to establish cause of your symptoms and may prescribe you treatment for this prolong bleeding.
Hope this answers your question.